Sharjah24 - Reuters: Australia has lost more mammal species than any other continent and has one of the worst rates of species decline among the world's richest countries, a five-yearly environmental report card released by the government on Tuesday said.

Some animals such as the blue-tailed skink are now only known to exist in captivity, while the central rock-rat and Christmas Island flying fox are among mammals considered most at risk of extinction in the next 20 years, largely due to introduced predator species.

The sandalwood tree is also in decline.

The report, which comes after drought, bushfires and floods ravaged Australia over the past five years, said increasing temperatures, changing fire and rainfall trends, rising sea levels and ocean acidification were all having significant impacts that would persist.

"The State of the Environment Report is a shocking document - it tells a story of crisis and decline in Australia's environment," Environment Minister Tanya Plibersek said in a statement, adding that the new Labor government would make the environment a priority.

"I won't be putting my head in the sand," she said.